Method and apparatus for transmitting and receiving HARQ responses in a communication system supporting sidelink communication

Abstract

Disclosed are a method and apparatus for transmitting and receiving HARQ responses in a communication system supporting sidelink communication. The operating method for a transmitting terminal includes the following steps: receiving a higher-layer signaling message including PSFCH configuration information from a base station; transmitting an SCI including data resource allocation information to one or more receiving terminals; transmitting data to the one or more receiving terminals on a PSSCH indicated by the SCI; and monitoring a dedicated PSFCH resource region indicated by the PSFCH configuration information to receive a reception response to the SCI from one or more receiving terminals. Consequently, the performance of the communication system can be improved.

Description

Technical Field

[0001] The present invention relates to a sidelink communication technology, and more particularly, to a technology for transmitting and receiving a hybrid automatic repeat request (HARQ) response for sidelink communication performed in a groupcast scheme. Background Art

[0002] To handle the surge in wireless data following the commercialization of fourth-generation (4G) communication systems (e.g., Long Term Evolution (LTE) and LTE-Advanced (LTE-A)), consideration must be given not only to the frequency bands of 4G communication systems (e.g., bands below 6 GHz) but also to fifth-generation (5G) communication systems (e.g., New Radio (NR)), which utilize higher frequency bands than 4G systems (e.g., bands above 6 GHz). 5G communication systems can support enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), and massive machine type communication (mMTC).

[0003] 4G and 5G communication systems can support vehicle-to-everything (V2X) communication. V2X communication supported in cellular communication systems (e.g., 4G and 5G communication systems) can be referred to as "cellular-V2X (C-V2X) communication." V2X communication (e.g., C-V2X communication) can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, and the like.

[0004] In a cellular communication system, V2X communication (e.g., C-V2X communication) can be performed based on a sidelink communication technology (e.g., a proximity-based service (ProSe) communication technology, a device-to-device (D2D) communication technology, etc.). For example, a sidelink channel for vehicles participating in V2V communication can be established, and communication between vehicles can be performed using the sidelink channel. Sidelink communication can be performed using configured grant (CG) resources. CG resources can be periodically configured, and periodic data (e.g., periodic sidelink data) can be transmitted using the CG resources.

[0005] At the same time, sidelink communication can be performed based on a unicast scheme, a multicast scheme, a groupcast scheme, and / or a broadcast scheme. In addition, a blind retransmission scheme can be supported for retransmission of sidelink data in sidelink communication, and a hybrid automatic repeat request (HARQ) operation can be supported. As a HARQ response (e.g., HARQ feedback) for the sidelink data, an acknowledgment (ACK) or a negative ACK (NACK) can be transmitted.

[0006] Alternatively, a NACK-only feedback scheme may be used as a transmission scheme for the HARQ response. In this case, when the sidelink data has been successfully received, a HARQ response (e.g., ACK) may not be transmitted, whereas when reception of the sidelink data fails, a HARQ response (e.g., NACK) may be transmitted. Here, when reception of sidelink control information (SCI) including scheduling information for the sidelink data fails, the receiving terminal (e.g., the terminal receiving the sidelink data) may not transmit a HARQ response because the receiving terminal (e.g., the terminal receiving the sidelink data) cannot detect the sidelink data.

[0007] Since a transmitting terminal (e.g., the terminal transmitting the sidelink data) that has transmitted the SCI and sidelink data does not receive a HARQ response from the receiving terminal, it can be determined that the receiving terminal has successfully received the sidelink data. In other words, when using a NACK-only feedback scheme, even when reception of the sidelink data fails, the transmitting terminal can determine that the transmitting terminal has successfully received the sidelink data. In this case, since the performance of the communication system may be degraded, a method for solving this problem is needed. Summary of the Invention

[0008] Technical issues

[0009] An object of the present invention to solve the above-mentioned problems is to provide a method and apparatus for transmitting and receiving a Hybrid Automatic Repeat Request (HARQ) response in a communication system supporting sidelink communication.

[0010] Solutions to Problems

[0011] The operating method of a transmitting terminal according to the first exemplary embodiment of the present invention for achieving this purpose may include: receiving a higher layer signaling message including physical sidelink feedback channel (PSFCH) configuration information from a base station; sending sidelink control information (SCI) including resource allocation information of data to one or more receiving terminals; sending data to one or more receiving terminals on a physical sidelink shared channel (PSSCH) indicated by the SCI; performing a monitoring operation on a dedicated PSFCH resource region indicated by the PSFCH configuration information to receive a reception response to the SCI from one or more receiving terminals; and performing a monitoring operation on a shared PSFCH resource region indicated by the PSFCH configuration information to receive a hybrid automatic repeat request (HARQ) response to the data from one or more receiving terminals.

[0012] The dedicated PSFCH resource region and the shared PSFCH resource region may be arranged in the same symbol, and the dedicated PSFCH resource region may be multiplexed with the shared PSFCH resource region in the frequency domain.

[0013] The dedicated PSFCH resource region and the shared PSFCH resource region may be arranged in the same frequency resource, and the dedicated PSFCH resource region may be multiplexed with the shared PSFCH resource region in the time domain.

[0014] The PSFCH configuration information may include information indicating a ratio between the size of the shared PSFCH resource region and the size of the dedicated PSFCH resource region.

[0015] The PSFCH configuration information can be configured with PSFCH format 1 and PSFCH format 2, and PSFCH format 1 or PSFCH format 2 can be used according to the number of one or more receiving terminals, and PSFCH format 1 and PSFCH format 2 can respectively indicate a dedicated PSFCH resource area and a shared PSFCH resource area.

[0016] The PSFCH configuration information can be configured with PSFCH configuration information 1 and PSFCH configuration information 2. When the number of one or more receiving terminals is less than or equal to a threshold, PSFCH configuration information 1 can be used. When the number of one or more receiving terminals exceeds the threshold, PSFCH configuration information 1 and PSFCH configuration information 2 can be used, and PSFCH configuration information 1 and PSFCH configuration information 2 can respectively indicate a dedicated PSFCH resource area and a shared PSFCH resource area.

[0017] The SCI may further include information indicating a dedicated PSFCH resource region and a shared PSFCH resource region, and the dedicated PSFCH resource region and the shared PSFCH resource region may be configured within a resource range indicated by the PSFCH configuration information.

[0018] When the reception response indicates that the SCI has been successfully received, and no HARQ response is received on the shared PSFCH resource region, it can be determined that the data has been successfully received by one or more receiving terminals.

[0019] When no reception response is received, it can be determined that reception of the SCI has failed in one or more reception terminals.

[0020] The operating method of the receiving terminal according to the second exemplary embodiment of the present invention for achieving this purpose may include: receiving a higher layer signaling message including physical sidelink feedback channel (PSFCH) configuration information from a base station; obtaining side link control information (SCI) including resource allocation information of data from a transmitting terminal; sending a reception response for the SCI to the transmitting terminal through a dedicated PSFCH resource area indicated by the PSFCH configuration information; and performing a monitoring operation on a physical sidelink shared channel (PSSCH) indicated by the SCI to obtain data from the transmitting terminal.

[0021] The operating method may further include, when data reception fails, sending a negative acknowledgement (NACK) for the data to the transmitting terminal through a shared PSFCH resource region indicated by the PSFCH configuration information, wherein the shared PSFCH resource region is configured independently of the dedicated PSFCH resource region.

[0022] When the dedicated PSFCH resource area and the shared PSFCH resource area are arranged in the same symbol, the dedicated PSFCH resource area can be multiplexed with the shared PSFCH resource area in the frequency domain; when the dedicated PSFCH resource area and the shared PSFCH resource area are arranged in the same frequency resource, the dedicated PSFCH resource area can be multiplexed with the shared PSFCH resource area in the time domain.

[0023] The PSFCH configuration information may include information indicating a ratio between the size of the shared PSFCH resource region and the size of the dedicated PSFCH resource region.

[0024] The PSFCH configuration information can be configured with PSFCH format 1 and PSFCH format 2, and PSFCH format 1 or PSFCH format 2 can be used according to the number of one or more receiving terminals, and the union of the shared PSFCH resource area and the dedicated PSFCH resource area indicated by PSFCH format 1 can be different from the union of the shared PSFCH resource area and the dedicated PSFCH resource area indicated by PSFCH format 2.

[0025] The PSFCH configuration information can be configured with PSFCH configuration information 1 and PSFCH configuration information 2. When the number of one or more receiving terminals is less than or equal to a threshold, PSFCH configuration information 1 can be used. When the number of one or more receiving terminals exceeds the threshold, PSFCH configuration information 1 and PSFCH configuration information 2 can be used, and the shared PSFCH resource area and dedicated PSFCH resource area indicated by PSFCH configuration information 1 can be configured independently of the shared PSFCH resource area and dedicated PSFCH resource area indicated by PSFCH configuration information 2.

[0026] The SCI may further include information indicating a dedicated PSFCH resource region and a shared PSFCH resource region, and the dedicated PSFCH resource region and the shared PSFCH resource region may be configured within a resource range indicated by the PSFCH configuration information.

[0027] The operating method of the base station according to the second exemplary embodiment of the present invention for achieving this purpose may include: configuring a dedicated physical sidelink feedback channel (PSFCH) resource area for sending and receiving reception responses for sidelink control information (SCI); configuring a shared PSFCH resource area for sending and receiving a hybrid automatic repeat request (HARQ) response for data scheduled by the SCI; and sending a higher layer signaling message including PSFCH configuration information, wherein the PSFCH configuration information includes configuration information of the dedicated PSFCH resource area and configuration information of the shared PSFCH resource area.

[0028] When the dedicated PSFCH resource area and the shared PSFCH resource area are arranged in the same symbol, the dedicated PSFCH resource area can be multiplexed with the shared PSFCH resource area in the frequency domain; when the dedicated PSFCH resource area and the shared PSFCH resource area are arranged in the same frequency resource, the dedicated PSFCH resource area can be multiplexed with the shared PSFCH resource area in the time domain.

[0029] The PSFCH configuration information can be configured with PSFCH format 1 and PSFCH format 2, and PSFCH format 1 or PSFCH format 2 can be used according to the number of one or more receiving terminals, and the union of the shared PSFCH resource area and the dedicated PSFCH resource area indicated by PSFCH format 1 can be different from the union of the shared PSFCH resource area and the dedicated PSFCH resource area indicated by PSFCH format 2.

[0030] The PSFCH configuration information can be configured with PSFCH configuration information 1 and PSFCH configuration information 2. When the number of one or more receiving terminals is less than or equal to a threshold, PSFCH configuration information 1 can be used. When the number of one or more receiving terminals exceeds the threshold, PSFCH configuration information 1 and PSFCH configuration information 2 can be used, and the shared PSFCH resource area and dedicated PSFCH resource area indicated by PSFCH configuration information 1 can be configured independently of the shared PSFCH resource area and dedicated PSFCH resource area indicated by PSFCH configuration information 2.

[0031] Effects of the Invention

[0032] According to the present invention, the PSFCH resource region can be classified into a dedicated PSFCH resource region and a shared (or public) PSFCH resource region. The dedicated PSFCH resource region can be used to send and receive a reception response for sidelink control information (SCI). The shared PSFCH resource region can be used to send and receive a hybrid automatic repeat request (HARQ) response for data. When the SCI is successfully received, the receiving terminal can send information indicating that the SCI has been successfully received (hereinafter referred to as an "SCI reception indicator").

[0033] When the SCI reception indicator is received from the receiving terminal, the transmitting terminal can determine that the receiving terminal has successfully received the SCI and can identify whether data has been received based on the receiving terminal's HARQ response. On the other hand, when the SCI reception indicator is not received, the transmitting terminal can determine that SCI reception at the receiving terminal has failed. When the SCI reception indicator is used in a NACK-only feedback scheme, NACKs are not interpreted as ACKs, thereby improving data transmission performance. In other words, the performance of the communication system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a conceptual diagram illustrating a V2X communication scenario.

[0035] Figure 2 is a conceptual diagram illustrating an exemplary embodiment of a cellular communication system.

[0036] Figure 3 is a conceptual diagram illustrating an exemplary embodiment of a communication node constituting a cellular communication system.

[0037] Figure 4 is a block diagram illustrating an exemplary embodiment of a user plane protocol stack of a UE performing sidelink communications.

[0038] Figure 5 is a block diagram illustrating a first exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication.

[0039] Figure 6 is a block diagram illustrating a second exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication.

[0040] Figure 7 is a sequence diagram illustrating a first exemplary embodiment of a method for transmitting and receiving a HARQ response in a communication system supporting sidelink communication.

[0041] Figure 8 is a conceptual diagram illustrating a first exemplary embodiment of a PSFCH resource region in a communication system supporting sidelink communication.

[0042] Figure 9 is a conceptual diagram illustrating a second exemplary embodiment of a PSFCH resource region in a communication system supporting sidelink communication.

[0043] Figure 10 is a conceptual diagram illustrating a third exemplary embodiment of a PSFCH resource region in a communication system supporting sidelink communication.

[0044] Figure 11 is a sequence diagram illustrating a second exemplary embodiment of a method for transmitting and receiving a HARQ response in a communication system supporting sidelink communication. DETAILED DESCRIPTION

[0045] Although the present invention is susceptible to various modifications and alternative forms, specific embodiments are shown by way of example in the drawings and described in detail. However, it should be understood that this description is not intended to limit the invention to specific embodiments, but rather, the invention is intended to cover all modifications, equivalents, and alternative forms that fall within the spirit and scope of the invention.

[0046] Although the terms "first," "second," etc., may be used herein with reference to various elements, these elements should not be construed as being limited to these terms. These terms are used only to distinguish one element from another. For example, a first element may be referred to as a second element, and a second element may be referred to as a first element, without departing from the scope of the present invention. The term "and / or" includes any and all combinations of one or more of the associated enumerated items.

[0047] It should be understood that when an element is referred to as being "connected" or "engaged" to another element, it can be directly connected or engaged to the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly engaged" to another element, there are no intervening elements.

[0048] The terms used in this article are only used to describe the purpose of specific embodiments and are not intended to be used to limit the embodiments of the present invention. As used herein, the singular forms "a", "an" and "the" are intended to also include plural forms, unless the context clearly indicates otherwise. It will also be further understood that when the terms "comprise", "comprises", "includes" and / or "comprising" are used in this article, it is indicated that the features, values, steps, operations, elements, parts and / or combinations thereof are present, but the presence or addition of one or more other features, values, steps, operations, elements, parts and / or combinations thereof are not excluded.

[0049] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. It is further understood that terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning of the term in the context of the relevant technology and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0050] Hereinafter, preferred exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, for ease of overall understanding, the same reference numerals refer to the same elements throughout the description of the drawings, and repeated description of the same reference numerals will be omitted.

[0051] Figure 1 is a conceptual diagram illustrating a V2X communication scenario.

[0052] like Figure 1As shown, V2X communication may include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc. V2X communication may be supported by a cellular communication system (e.g., cellular communication system 140), and V2X communication supported by cellular communication system 140 may be referred to as "cellular-V2X (C-V2X) communication." Here, cellular communication system 140 may include a 4G communication system (e.g., an LTE communication system or an LTE-A communication system), a 5G communication system (e.g., an NR communication system), etc.

[0053] V2V communication may include communication between a first vehicle 100 (e.g., a communication node located in vehicle 100) and a second vehicle 110 (e.g., a communication node located in vehicle 110). Various driving information, such as speed, heading, time, and location, may be exchanged between vehicles 100 and 110 via V2V communication. For example, autonomous driving (e.g., platooning) may be supported based on the driving information exchanged via V2V communication. V2V communication supported in the cellular communication system 140 may be performed based on "sidelink" communication technologies (e.g., ProSe and D2D communication technologies, etc.). In this case, communication between vehicles 100 and 110 may be performed using at least one sidelink channel established between the vehicles 100 and 110.

[0054] V2I communication may include communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and an infrastructure (e.g., a road side unit (RSU)) 120 located on the roadside. The infrastructure 120 may also include a traffic light or streetlight located on the roadside. For example, when V2I communication is performed, communication may be performed between the communication node located in the first vehicle 100 and the communication node located in the traffic light. Traffic information, driving information, and the like may be exchanged between the first vehicle 100 and the infrastructure 120 through V2I communication. V2I communication supported in the cellular communication system 140 may also be performed based on a sidelink communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, communication between the vehicle 100 and the infrastructure 120 may be performed using at least one sidelink channel established between the vehicle 100 and the infrastructure 120.

[0055] V2P communication may include communication between a first vehicle 100 (e.g., a communication node located in the vehicle 100) and a person 130 (e.g., a communication node carried by the person 130). Driving information of the first vehicle 100 and movement information of the person 130, such as speed, heading, time, and location, may be exchanged between the vehicle 100 and the person 130 through V2P communication. By determining a dangerous situation based on the obtained driving information and movement information, the communication node located in the vehicle 100 or the communication node carried by the person 130 may generate an alert indicating the danger. V2P communication supported in the cellular communication system 140 may be performed based on a sidelink communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, communication between the communication node located in the vehicle 100 and the communication node carried by the person 130 may be performed using at least one sidelink channel established between the communication nodes.

[0056] V2N communication may be communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and a server connected via the cellular communication system 140. V2N communication may be performed based on 4G communication technology (e.g., LTE or LTE-A) or 5G communication technology (e.g., NR). In addition, V2N communication may be performed based on Wireless Access in Vehicular Environments (WAVE) communication technology, Wireless Local Area Network (WLAN) communication technology defined in Institute of Electrical and Electronics Engineers (IEEE) 802.11, or Wireless Personal Area Network (WPAN) communication technology defined in IEEE 802.15.

[0057] Meanwhile, the cellular communication system 140 supporting V2X communication may be configured as follows.

[0058] Figure 2 is a conceptual diagram illustrating an exemplary embodiment of a cellular communication system.

[0059] like Figure 2 As shown, the cellular communication system may include an access network and a core network. The access network may include a base station 210, a relay station 220, and user equipment (UE) 231 to 236. UE 231 to UE 236 may include a Figure 1 The communication nodes in the vehicle 100 and the vehicle 110 are located Figure 1The communication nodes in the infrastructure 120 are Figure 1 When the cellular communication system supports 4G communication technology, the core network may include a serving gateway (S-GW) 250, a packet data network (PDN) gateway (P-GW) 260, a mobility management entity (MME) 270, and the like.

[0060] When the cellular communication system supports 5G communication technology, the core network may include a user plane function (UPF) 250, a session management function (SMF) 260, and an access and mobility management function (AMF) 270, etc. Alternatively, when the cellular communication system operates in non-standalone (NSA) mode, the core network composed of the S-GW 250, the P-GW 260, and the MME 270 may support 5G communication technology as well as 4G communication technology, and the core network composed of the UPF 250, the SMF 260, and the AMF 270 may support 4G communication technology as well as 5G communication technology.

[0061] In addition, when the cellular communication system supports network slicing technology, the core network can be divided into multiple logical network slices. For example, network slices supporting V2X communication (e.g., V2V network slices, V2I network slices, V2P network slices, V2N network slices, etc.) can be configured, and V2X communication can be supported by the V2X network slices configured in the core network.

[0062] The communication nodes comprising a cellular communication system (e.g., base stations, relay stations, UE, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) can perform communication by utilizing at least one communication technology among code division multiple access (CDMA) technology, time division multiple access (TDMA) technology, frequency division multiple access (FDMA) technology, orthogonal frequency division multiple access (OFDM) technology, filtered OFDM technology, orthogonal frequency division multiple access (OFDMA) technology, single carrier FDMA (SC-FDMA) technology, non-orthogonal multiple access (NOMA) technology, generalized frequency division multiplexing (GFDM) technology, filter bank multi-carrier (FBMC) technology, universal filtered multi-carrier (UFMC) technology and space division multiple access (SDMA) technology.

[0063] The communication nodes comprising the cellular communication system (e.g., base station, relay station, UE, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) can be configured as follows.

[0064] Figure 3 is a conceptual diagram illustrating an exemplary embodiment of a communication node constituting a cellular communication system.

[0065] like Figure 3 As shown, the communication node 300 may include at least one processor 310, a memory 320, and a transceiver 330 connected to a network for performing communication. In addition, the communication node 300 may further include an input interface device 340, an output interface device 350, a storage device 360, etc. Each component included in the communication node 300 can communicate with each other when connected through a bus 370.

[0066] However, each component included in the communication node 300 may be connected to the processor 310 via a separate interface or a separate bus instead of the common bus 370. For example, the processor 310 may be connected to at least one of the memory 320, the transceiver 330, the input interface device 340, the output interface device 350, and the storage device 360 via a dedicated interface.

[0067] The processor 310 may execute at least one instruction stored in at least one of the memory 320 and the storage device 360. The processor 310 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the method according to the embodiment of the present invention is executed. Each of the memory 320 and the storage device 360 may include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 320 may include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0068] Reference again Figure 2In the communication system, base station 210 may form a macro cell or a small cell and may be connected to a core network via an ideal backhaul or a non-ideal backhaul. Base station 210 may transmit signals received from the core network to UEs 231 to 236 and relay station 220, and may transmit signals received from UEs 231 to 236 and relay station 220 to the core network. UE#1 231, UE#2 232, UE#4 234, UE#5 235, and UE#6 236 may be within the cell coverage of base station 210. UE#1 231, UE#2 232, UE#4 234, UE#5 235, and UE#6 236 may connect to base station 210 by performing a connection establishment procedure with base station 210. UE#1 231 , UE#2 232 , UE#4 234 , UE#5 235 , and UE#6 236 may communicate with the base station 210 after being connected to the base station 210 .

[0069] Relay station 220 can be connected to base station 210 and can relay communications between base station 210 and UE#3 233 and UE#4 234. That is, relay station 220 can transmit signals received from base station 210 to UE#3 233 and UE#4 234, and can transmit signals received from UE#3 233 and UE#4 234 to base station 210. UE#4 234 can be within the cell coverage of both base station 210 and relay station 220, and UE#3 233 can be within the cell coverage of relay station 220. That is, UE#3 233 can be outside the cell coverage of base station 210. UE#3 233 and UE#4 234 can connect to relay station 220 by performing a connection establishment procedure with relay station 220. After connecting to relay station 220, UE#3 233 and UE#4 234 can communicate with relay station 220.

[0070] Base station 210 and relay station 220 can support multiple-input multiple-output (MIMO) technology (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multi-point (CoMP) communication technology, carrier aggregation (CA) communication technology, unlicensed band communication technology (e.g., licensed-assisted access (LAA), enhanced LAA (eLAA)), sidelink communication technology (e.g., ProSe communication technology, D2D communication technology), etc. UE#1 231, UE#2 232, UE#5 235, and UE#6 236 can perform operations corresponding to base station 210 and operations supported by base station 210. UE#3 233 and UE#4 234 can perform operations corresponding to relay station 220 and operations supported by relay station 220.

[0071] Here, the base station 210 may refer to a Node B (NB), an evolved Node B (eNB), a base transceiver station (BTS), a radio remote head (RRH), a transmission reception point (TRP), a radio unit (RU), a roadside unit (RSU), a radio transceiver, an access point, an access node, etc. The relay station 220 may refer to a small base station, a relay node, etc. Each of UE#1 231 to UE#6 236 may refer to a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, an on-broad unit (OBU), etc.

[0072] Meanwhile, the communication between UE#5 235 and UE#6 236 may be performed based on the sidelink communication technology. The sidelink communication may be performed based on a one-to-one scheme or a one-to-many scheme. When performing V2V communication using the sidelink communication technology, UE#5 235 may be located at Figure 1 The communication node in the first vehicle 100, and UE#6 236 may be located Figure 1 When V2I communication is performed using the sidelink communication technology, UE#5 235 may be a communication node located in the second vehicle 110. Figure 1 The communication node in the first vehicle 100, and UE#6 236 may be located Figure 1 When performing V2P communication using the sidelink communication technology, UE#5 235 may be a communication node located at Figure 1 The communication node in the first vehicle 100, and UE#6 236 may be composed of Figure 1 The person 130 carries the communication node.

[0073] The scenarios in which the side link communication is applied can be classified according to the locations of the UEs (eg, UE#5 235 and UE#6 236) participating in the side link communication as shown in Table 1 below. For example, Figure 2 The scenario of sidelink communication between UE#5 235 and UE#6 236 shown in FIG may be sidelink communication scenario #C.

[0074] [Table 1]

[0075]

[0076] Meanwhile, the user plane protocol stack of the UEs (eg, UE#5 235 and UE#6 236) performing sidelink communication may be configured as follows.

[0077] Figure 4 is a block diagram illustrating an exemplary embodiment of a user plane protocol stack of a UE performing sidelink communications.

[0078] like Figure 4 As shown, the UE on the left can be Figure 2 The UE#5 235 shown in FIG, and the right UE may be Figure 2 UE#6 236 is shown. The sidelink communication scenario between UE#5 235 and UE#6 236 can be one of the sidelink communication scenarios #A to #D in Table 1. The user plane protocol stack of each of UE#5 235 and UE#6 236 can include a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, and a packet data convergence protocol (PDCP) layer.

[0079] Sidelink communication between UE#5 235 and UE#6 236 may be performed using a PC5 interface (e.g., a PC5-U interface). A Layer 2 identifier (ID) (e.g., a source Layer 2 ID, a destination Layer 2 ID) may be used for sidelink communication, and the Layer 2 ID may be an ID configured for V2X communication (e.g., V2X traffic). Furthermore, in sidelink communication, a hybrid automatic repeat request (HARQ) feedback operation may be supported, and either RLC acknowledged mode (RLC AM) or RLC unacknowledged mode (RLC UM) may be supported.

[0080] Meanwhile, the control plane protocol stack of the UEs (eg, UE#5 235 and UE#6 236) performing sidelink communication may be configured as follows.

[0081] Figure 5 is a block diagram illustrating a first exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication, Figure 6 is a block diagram illustrating a second exemplary embodiment of a control plane protocol stack of a UE performing sidelink communication.

[0082] like Figure 5 and Figure 6 As shown, the UE on the left can be Figure 2 The UE#5 235 shown in FIG, and the right UE may be Figure 2 UE#6 236 is shown. The sidelink communication scenario between UE#5 235 and UE#6 236 can be one of the sidelink communication scenarios A to D in Table 1. Figure 5The control plane protocol stack shown in FIG. 5 may be a control plane protocol stack for sending and receiving broadcast information (eg, a Physical Sidelink Broadcast Channel (PSBCH)).

[0083] Figure 5 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, and a radio resource control (RRC) layer. Sidelink communication between UE#5 235 and UE#6 236 may be performed using a PC5 interface (eg, a PC5-C interface). Figure 6 The control plane protocol stack shown may be a control plane protocol stack for one-to-one sidelink communication. Figure 6 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, a PDCP layer, and a PC5 signaling protocol layer.

[0084] Meanwhile, channels used in sidelink communication between UE#5 235 and UE#6 236 may include a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), a physical sidelink discovery channel (PSDCH), and a physical sidelink broadcast channel (PSBCH). The PSSCH may be used to transmit and receive sidelink data and may be configured in the UE (e.g., UE#5 235 or UE#6 236) through higher layer signaling. The PSCCH may be used to transmit and receive sidelink control information (SCI) and may also be configured in the UE (e.g., UE#5 235 or UE#6 236) through higher layer signaling.

[0085] The PSDCH may be used for the discovery process. For example, a discovery signal may be transmitted via the PSDCH. The PSBCH may be used to send and receive broadcast information (e.g., system information). In addition, a demodulation reference signal (DM-RS), synchronization signals, and the like may be used in sidelink communications between UE#5 235 and UE#6 236. The synchronization signals may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS).

[0086] Meanwhile, sidelink transmission modes (TM) may be classified into sidelink TM#1 to TM#4, as shown in Table 2 below.

[0087] [Table 2]

[0088] SidelinkTM illustrate #1 Transmission using resources scheduled by the base station #2 UE automatic transmission without base station scheduling #3 Transmission using resources scheduled by base stations in V2X communications #4 UE automatic transmission without base station scheduling in V2X communication

[0089] When sidelink TM#3 or TM#4 is supported, each of UE#5 235 and UE#6 236 can perform sidelink communication using a resource pool configured by base station 210. A resource pool can be configured for each of sidelink control information and sidelink data.

[0090] The resource pool for sidelink control information can be configured based on an RRC signaling process (e.g., a dedicated RRC signaling process, a broadcast RRC signaling process). The resource pool for receiving sidelink control information can be configured by a broadcast RRC signaling process. When sidelink TM#3 is supported, the resource pool for transmitting sidelink control information can be configured by a dedicated RRC signaling process. In this case, the sidelink control information can be transmitted through resources scheduled by the base station 210 within the resource pool configured by the dedicated RRC signaling process. When sidelink TM#4 is supported, the resource pool for transmitting sidelink control information can be configured by a dedicated RRC signaling process or a broadcast RRC signaling process. In this case, the sidelink control information can be sent through resources automatically selected by a UE (e.g., UE#5 235 or UE#6 236) within the resource pool configured by the dedicated RRC signaling process or the broadcast RRC signaling process.

[0091] When sidelink TM#3 is supported, a resource pool for transmitting and receiving sidelink data may not be configured. In this case, sidelink data can be transmitted and received using resources scheduled by base station 210. When sidelink TM#4 is supported, a resource pool for transmitting and receiving sidelink data can be configured using a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, sidelink data can be transmitted and received using resources automatically selected by a UE (e.g., UE#5 235 or UE#6 236) within the resource pool configured using the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0092] Hereinafter, a method for sending and receiving HARQ responses in side link communications will be described. Even when describing a method to be performed at a first communication node in a communication node (e.g., sending or receiving a signal), the corresponding second communication node may also perform a method corresponding to the method performed at the first communication node (e.g., receiving or sending a signal). That is, when describing the operation of UE#1 (e.g., vehicle #1), the corresponding UE#2 (e.g., vehicle #2) may perform an operation corresponding to the operation of UE#1. Conversely, when describing the operation of UE#2, the corresponding UE#1 may perform an operation corresponding to the operation of UE#2. In the exemplary embodiment described below, the operation of the vehicle may be the operation of a communication node located in the vehicle.

[0093] In an exemplary embodiment, the HARQ response may indicate an acknowledgment (ACK), a negative ACK (NACK), and / or discontinuous transmission (DTX). The exemplary embodiment applied to the case where the HARQ response indicates ACK may also be applied to the case where the HARQ response indicates NACK or DTX. The exemplary embodiment applied to the case where the HARQ response indicates NACK may also be applied to the case where the HARQ response indicates ACK or DTX. The exemplary embodiment applied to the case where the HARQ response indicates DTX may also be applied to the case where the HARQ response indicates ACK or NACK.

[0094] In an exemplary embodiment, signaling may be a combination of one or two or more of higher layer signaling, MAC signaling, and physical (PHY) signaling. Messages used for higher layer signaling may be referred to as "higher layer messages" or "higher layer signaling messages." Messages used for MAC signaling may be referred to as "MAC messages" or "MAC signaling messages." Messages used for PHY signaling may be referred to as "PHY messages" or "PHY signaling messages." Higher layer signaling may refer to the operation of sending and receiving system information (e.g., master information block (MIB), system information block (SIB)) and / or RRC messages. MAC signaling may refer to the operation of sending and receiving MAC control elements (CE). PHY signaling may refer to the operation of sending and receiving control information (e.g., downlink control information (DCI), uplink control information (UCI), or SCI).

[0095] The sidelink signal may be a synchronization signal and a reference signal used for sidelink communication. For example, the synchronization signal may be a synchronization signal / physical broadcast channel (SS / PBCH) block, a sidelink synchronization signal (SLSS), a primary sidelink synchronization signal (PSSS), a secondary sidelink synchronization signal (SSSS), etc. The reference signal may be a channel state information-reference signal (CSI-RS), a DM-RS, a phase tracking-reference signal (PT-RS), a cell-specific reference signal (CRS), a sounding reference signal (SRS), a discovery reference signal (DRS), etc.

[0096] A sidelink channel may be a PSSCH, PSCCH, PSDCH, PSBCH, or physical sidelink feedback channel (PSFCH). Furthermore, a sidelink channel may refer to a sidelink channel that includes a sidelink signal mapped to specific resources in a corresponding sidelink channel. Sidelink communications may support broadcast services, multicast services, groupcast services, and unicast services.

[0097] In sidelink communication (e.g., sidelink communication for V2X communication), HARQ feedback operation can be supported. HARQ feedback operation for sidelink-multicast communication can be performed in two schemes. Sidelink-multicast communication can mean sidelink communication performed in a multicast scheme. In the first scheme, all receiving terminals participating in the sidelink-multicast communication (e.g., terminals receiving sidelink data) can share a PSFCH resource region (e.g., a PSFCH resource pool), and NACK can be sent only to a transmitting terminal (e.g., a terminal sending sidelink data) by utilizing the PSFCH resource region.

[0098] In this case, when the sidelink data has been successfully received, the receiving terminal may not send an ACK to the transmitting terminal, but when the reception of the sidelink data fails, a NACK may be sent to the transmitting terminal. This scheme may be referred to as a "NACK-only feedback scheme." In an exemplary embodiment, "successfully receiving data, information, and / or signals" may mean "successfully decoding the data, information, and / or signals." "Failure to receive data, information, and / or signals" may mean "failure to decode the data, information, and / or signals."

[0099] In the second scheme, a PSFCH resource region can be independently allocated (e.g., configured) to each receiving terminal, and each receiving terminal can transmit a HARQ response (e.g., ACK, NACK, or DTX) to the transmitting terminal by utilizing the allocated PSFCH resource region (e.g., a dedicated PSFCH resource region). In addition, a combination of the first and second schemes described above can be used for transmission of the HARQ response. Here, the PSFCH can be in the form of a sequence.

[0100] On the other hand, when using a NACK-only feedback scheme, the transmitting terminal may mistakenly identify the reception status of the sidelink data in the receiving terminal. For example, when the decoding of the SCI (e.g., PSCCH) fails at the receiving terminal, the receiving terminal may not be able to send a HARQ response (e.g., NACK) for the sidelink data (e.g., PSSCH) scheduled by the SCI. This situation may be referred to as "DTX" or a "DTX situation." In this case, since no HARQ response (e.g., NACK) for the sidelink data is received from the receiving terminal, the transmitting terminal may determine that the sidelink data has been successfully received at the receiving terminal. A method for solving this problem may be needed.

[0101] Figure 7 is a sequence diagram illustrating a first exemplary embodiment of a method for transmitting and receiving a HARQ response in a communication system supporting sidelink communication.

[0102] like Figure 7 As shown, the communication system may include a base station, a transmitting terminal, and a receiving terminal. The transmitting terminal may be a terminal for transmitting side link data (eg, PSSCH), and the receiving terminal may be a terminal for receiving side link data. The base station may be Figure 2 The base station 210 is shown. The transmitting terminal may be Figure 2 UE#5 235 is shown, and the receiving terminal may be Figure 2 UE#6 236 is shown. Alternatively, the transmitting terminal may be Figure 2 UE#6 236 is shown, and the receiving terminal may be Figure 2 UE#5 235 is shown. Each of the transmitting terminal and the receiving terminal may be located in a corresponding vehicle. The base station, the transmitting terminal, and the receiving terminal may be configured to communicate with Figure 3 The communication nodes 300 shown are the same or similar. The sending terminal and the receiving terminal may support Figures 4 to 6 The protocol stack shown. The transmitting terminal and the receiving terminal can be connected to the base station and can perform side link communication based on the scheduling of the base station. Alternatively, the transmitting terminal and the receiving terminal can be located outside the coverage of the base station and can perform side link communication without scheduling the base station.

[0103] The base station may generate sidelink configuration information and transmit the sidelink configuration information via higher-layer signaling (S701). Terminals (e.g., a transmitting terminal and a receiving terminal) may receive the sidelink configuration information from the base station and may perform sidelink communication based on the sidelink configuration information. Here, the transmitting terminal and the receiving terminal may perform sidelink-multicast communication.

[0104] The transmitting terminal may generate an SCI including scheduling information (e.g., resource allocation information) of the sidelink data (e.g., PSSCH) and may send the SCI to the receiving terminal (S702). The SCI may include "first-phase SCI" or both "first-phase SCI" and "second-phase SCI". The SCI (e.g., first-phase SCI) may be transmitted on the PSCCH, and the second-phase SCI may be transmitted on the PSSCH. The SCI may be a common SCI sent to all receiving terminals participating in the sidelink-multicast communication. Alternatively, the SCI may be a dedicated SCI sent to each receiving terminal participating in the sidelink-multicast communication.

[0105] The first-stage SCI may include at least one information element selected from the group consisting of priority information, frequency resource allocation information, time resource allocation information, resource reservation period information, DMRS pattern information, second-stage SCI format information, beta_offset indicator, number of DMRS ports, and modulation and coding scheme (MCS) information, and combinations thereof. The second-stage SCI may include at least one information element selected from the group consisting of a HARQ processor identifier (ID), a redundancy version (RV), a source ID, a destination ID, CSI request information, a regional ID, and a communication range requirement, and combinations thereof. In addition, the SCI (e.g., the first-stage SCI and / or the second-stage SCI) may further include information indicating PSFCH resources for HARQ feedback (e.g., frequency resource allocation information, time resource allocation information) and / or information for transmitting HARQ feedback.

[0106] The receiving terminal may receive SCI (e.g., first-phase SCI and / or second-phase SCI) from the transmitting terminal and may identify information elements (e.g., PSSCH resource information, PSFCH resource information, etc.) included in the SCI. The transmitting terminal may transmit sidelink data to the receiving terminal on the PSSCH indicated by the SCI (S703). The receiving terminal may receive sidelink data from the transmitting terminal by monitoring the PSSCH.

[0107] Each of the receiving terminals can send a HARQ response to the sidelink data to the transmitting terminal on the PSFCH indicated by the SCI (S704). Alternatively, the PSFCH can be configured by higher layer signaling. If the decoding of the sidelink data is successful, an ACK for the sidelink data can be sent at step S704. If the decoding of the sidelink data fails, a NACK for the sidelink data can be sent at step S704. Alternatively, a NACK-only feedback scheme can be used. In this case, if the decoding of the sidelink data is successful, an ACK for the sidelink data will not be sent at step S704. If the decoding of the sidelink data fails, a NACK for the sidelink data can be sent at step S704.

[0108] The receiving terminal can receive a HARQ response from the receiving terminal by performing a monitoring operation on the PSFCH. When the HARQ response indicates ACK, the transmitting terminal can determine that the side link data has been successfully received at the receiving terminal. When the HARQ response indicates NACK, the transmitting terminal can determine that the reception of the side link data at the receiving terminal has failed. Alternatively, a NACK-only feedback scheme can be used. In this case, if no HARQ response is received, the transmitting terminal can determine that the side link data has been successfully received at the receiving terminal. If NACK is received, the transmitting terminal can determine that the reception of the side link data at the receiving terminal has failed. When it is determined that the receiving terminal has failed to receive the side link data, the transmitting terminal can perform a retransmission process for the side link data.

[0109] At the same time, the PSFCH resource area may include a shared (or public) PSFCH resource area and a dedicated PSFCH resource area. The PSFCH resource area may be configured within a resource pool and may be referred to as a PSFCH occasion. The shared PSFCH resource area may be used to send and receive NACKs for sidelink data (e.g., PSSCH). Here, the NACK may be transmitted in the form of a sequence or in the form of data. The dedicated PSFCH resource area may be used to send and receive information (e.g., ACK) indicating whether the SCI (e.g., PSCCH and / or PSSCH) for scheduling the transmission of sidelink data has been received and / or information (e.g., ACK) indicating whether the sidelink data has been received. For example, information indicating that the SCI has been successfully received may be transmitted on a dedicated PSFCH. Alternatively, information indicating that the reception of the SCI has failed may be transmitted on a dedicated PSFCH.

[0110] When performing sidelink-multicast communication, the shared PSFCH resource region can be shared by the receiving terminals participating in the sidelink-multicast communication. In this case, each receiving terminal can use the shared PSFCH resource region to transmit a NACK for the sidelink data. The dedicated PSFCH resource region can include resources specifically allocated for each receiving terminal participating in the sidelink-multicast communication. Each receiving terminal can use the resources allocated to it within the dedicated PSFCH resource region to transmit information indicating whether it has received the SCI and / or information indicating whether it has received the sidelink data.

[0111] The resources allocated to each receiving terminal within the dedicated PSFCH resource region may be explicitly indicated by higher layer signaling, MAC signaling, and / or PHY signaling. Alternatively, the resources allocated to each receiving terminal within the dedicated PSFCH resource region may be implicitly indicated by the receiving terminal's ID (e.g., UE-specific ID, radio network temporary identifier (RNTI)).

[0112] Figure 8 is a conceptual diagram showing a first exemplary embodiment of a PSFCH resource region in a communication system supporting sidelink communication, Figure 9 is a conceptual diagram illustrating a second exemplary embodiment of a PSFCH resource region in a communication system supporting sidelink communication, Figure 10 is a conceptual diagram illustrating a third exemplary embodiment of a PSFCH resource region in a communication system supporting sidelink communication.

[0113] like Figure 8 As shown, the PSFCH resource area can be configured with one symbol in the time domain and can be configured with one or more resource blocks (RBs) in the frequency domain. In the frequency domain, the PSFCH resource area can be configured in units of subcarriers or RBs. The shared PSFCH resource area and the dedicated PSFCH resource area can be multiplexed in the frequency domain. In the frequency domain, the shared PSFCH resource area can be configured with one or more subcarriers or one or more RBs. The shared PSFCH resource area can be continuous or non-continuous in the frequency domain. In the frequency domain, the dedicated PSFCH resource area can be configured with one or more subcarriers or one or more RBs. The dedicated PSFCH resource area can be continuous or non-continuous in the frequency domain.

[0114] like Figure 9As shown, the PSFCH resource area can be configured with two or more symbols (e.g., a first symbol and a second symbol) in the time domain, and can be configured with one or more RBs in the frequency domain. The first symbol can be continuous or discontinuous with the second symbol in the time domain. In the frequency domain, the PSFCH resource area can be configured in units of subcarriers or RBs. The shared PSFCH resource area and the dedicated PSFCH resource area can be multiplexed in the frequency domain. In the frequency domain, the shared PSFCH resource area can be configured with one or more subcarriers or one or more RBs. The shared PSFCH resource area can be continuous or discontinuous in the frequency domain. In the frequency domain, the dedicated PSFCH resource area can be configured with one or more subcarriers or one or more RBs. The dedicated PSFCH resource area can be continuous or discontinuous in the frequency domain.

[0115] like Figure 10 As shown, the PSFCH resource area can be configured with two or more symbols (e.g., a first symbol and a second symbol) in the time domain, and can be configured with one or more RBs in the frequency domain. The first symbol can be continuous or discontinuous with the second symbol in the time domain. In the frequency domain, the PSFCH resource area can be configured in units of subcarriers or RBs. The shared PSFCH resource area and the dedicated PSFCH resource area can be multiplexed in the time domain. For example, the shared PSFCH resource area can be located in the first symbol of the two symbols, and the dedicated PSFCH resource area can be located in the second symbol of the two symbols. Alternatively, the dedicated PSFCH resource area can be located in the first symbol of the two symbols, and the shared PSFCH resource area can be located in the second symbol of the two symbols.

[0116] exist Figures 8 to 10 In an exemplary embodiment, if the number of receiving terminals participating in the sidelink-multicast communication is n, the dedicated PSFCH resource region can be divided into n sub-dedicated PSFCH resource regions. Each of the n sub-dedicated PSFCH resource regions can be configured in units of resource elements (REs). The n sub-dedicated PSFCH resource regions can be allocated to n receiving terminals, respectively. That is, one sub-dedicated PSFCH resource region can be allocated to one receiving terminal. Each of the n sub-dedicated PSFCH resource regions can be configured with continuous resources or non-contiguous resources in the frequency domain. n can be an integer of 1 or greater.

[0117] A sub-dedicated PSFCH resource area can be allocated to multiple receiving terminals. In this case, multiple receiving terminals can use different orthogonal codes to send information indicating whether the SCI has been received and / or information indicating whether the side link data has been received in the same sub-dedicated PSFCH resource area. The orthogonal code can be configured to the receiving terminal through higher layer signaling, MAC signaling and / or PHY signaling. Alternatively, the orthogonal code can be predefined in the technical specification. The above-mentioned sub-dedicated PSFCH resource area can be configured by a time division multiplexing (TDM) scheme, a frequency division multiplexing (FDM) scheme and a code division multiplexing (CDM) scheme, or a combination of two or more schemes.

[0118] The shared PSFCH resource region may be arranged from the start RB or the end RB of the PSFCH resource region. Here, the RB may be a physical RB (PRB), a virtual RB (VRB), or a common RB (CRB), the start RB may be the RB with the smallest index among the RBs constituting the PSFCH resource region, and the end RB may be the RB with the largest index among the RBs constituting the PSFCH resource region. The dedicated PSFCH resource region may be arranged in the remaining RBs, in which the shared PSFCH resource region is not arranged between the RBs constituting the PSFCH resource region. Alternatively, the dedicated PSFCH resource region may be arranged from the start RB or the end RB of the PSFCH resource region. The shared PSFCH resource region may be arranged in the remaining RBs, in which the dedicated PSFCH resource region is not arranged between the RBs constituting the PSFCH resource region.

[0119] In another exemplary embodiment, the shared PSFCH resource region and the dedicated PSFCH resource region may be multiplexed within the PSFCH resource region according to the FDM scheme and the TDM scheme. Figure 9 The scheme shown and Figure 10 The configuration can be done by combining the shown schemes.

[0120] Figure 11 is a sequence diagram illustrating a second exemplary embodiment of a method for transmitting and receiving a HARQ response in a communication system supporting sidelink communication.

[0121] like Figure 11As shown, the communication system may include a base station, a transmitting terminal, and a receiving terminal. The transmitting terminal may be a terminal for transmitting side link data (eg, PSSCH), and the receiving terminal may be a terminal for receiving side link data. The base station may be Figure 2 The base station 210 is shown. The transmitting terminal may be Figure 2 UE#5 235 is shown, and the receiving terminal may be Figure 2 UE#6 236 is shown. Alternatively, the transmitting terminal may be Figure 2 UE#6 236 is shown, and the receiving terminal may be Figure 2 UE#5 235 is shown. Each of the transmitting terminal and the receiving terminal may be located in a corresponding vehicle. The base station, the transmitting terminal, and the receiving terminal may be configured to communicate with Figure 3 The communication nodes 300 shown are the same or similar. The sending terminal and the receiving terminal may support Figures 4 to 6 The protocol stack shown. The transmitting terminal and the receiving terminal can be connected to the base station and can perform side link communication based on the scheduling of the base station. Alternatively, the transmitting terminal and the receiving terminal can be located outside the coverage of the base station and can perform side link communication without scheduling the base station.

[0122] The base station may generate sidelink configuration information and transmit the sidelink configuration information through higher layer signaling (S1101). The sidelink configuration information may include PSFCH configuration information (e.g., SL-PSFCH-Config). The PSFCH configuration information may include one or more of the information elements shown in Table 3, Table 4, or Table 6 below. In another exemplary embodiment, the information elements described in Table 3, Table 4, or Table 6 may be transmitted through a combination of one or two or more of higher layer signaling, MAC signaling, and PHY signaling.

[0123] [Table 3]

[0124]

[0125]

[0126] [Table 4]

[0127]

[0128]

[0129] In Table 4, multiple PSFCH formats (e.g., sl-PSFCH-format1, sl-PSFCH-format2) can be configured. That is, the PSFCH configuration information can be configured with multiple PSFCH formats. Multiple PSFCH formats can be configured according to the number of receiving terminals participating in the side link-multicast communication and / or the size of the PSFCH resource area. For example, when the number of receiving terminals participating in the side link-multicast communication is less than or equal to a threshold value (e.g., 15), sl-PSFCH-format1 can be used. When the number of receiving terminals participating in the side link-multicast communication exceeds a threshold value (e.g., 15), sl-PSFCH-format2 can be used.

[0130] Alternatively, when the size of the PSFCH resource region required for sidelink-multicast communication (e.g., the number of RBs, the number of subcarriers, the number of symbols, the number of REs) is less than or equal to a threshold, sl-PSFCH-format 1 may be used. When the size of the PSFCH resource region required for sidelink-multicast communication (e.g., the number of RBs, the number of subcarriers, the number of symbols, the number of REs) exceeds a threshold, sl-PSFCH-format 2 may be used. For example, when the PSFCH resource region is configured with one symbol in the time domain, sl-PSFCH-format 1 may be used. When the PSFCH resource region is configured with two symbols in the time domain, sl-PSFCH-format 2 may be used. The size of the PSFCH resource region (e.g., shared PSFCH resource region, dedicated PSFCH resource region) indicated by sl-PSFCH-format 1 may be set differently from the size of the PSFCH resource region (e.g., shared PSFCH resource region, dedicated PSFCH resource region) indicated by sl-PSFCH-format 2.

[0131] Each of sl-PSFCH-format1 and sl-PSFCH-format2 may include sl-PSFCH-RB-duration, sl-PSFCH-RB-Set, and / or sl-PSFCH-Ratio. sl-PSFCH-format1 may be configured independently of sl-PSFCH-format2. For example, each of sl-PSFCH-RB-duration, sl-PSFCH-RB-Set, and sl-PSFCH-RB-Ratio included in sl-PSFCH-format1 may be configured independently of sl-PSFCH-RB-duration, sl-PSFCH-RB-Set, and sl-PSFCH-RB-Ratio included in sl-PSFCH-format2. In addition, sl-PSFCH-Period may be configured independently for each of sl-PSFCH-format1 and sl-PSFCH-format2.

[0132] The sl-PSFCH-RB-Ratio configured by higher layer signaling may indicate candidate ratios (e.g., 1:5, 2:4, 3:3, 4:2, 5:1), and one of these ratios actually used may be indicated by MAC signaling and / or PHY signaling. The sl-PSFCH-RB-Ratio may be determined based on the number of receiving terminals participating in the side link-multicast communication. For example, the sl-PSFCH-RB-Ratio may be determined based on Table 5 below. For example, when the number of receiving terminals participating in the side link-multicast communication is 5 or less, sl-PSFCH-fomrat1 may be used, and the sl-PSFCH-RB-Ratio may be 1:5. In this case, if the PSFCH resource region includes 12 RBs, the shared PSFCH resource region may include 2 RBs, and the dedicated PSFCH resource region may include 10 RBs.

[0133] [Table 5]

[0134]

[0135] The table information described in Table 5 may be transmitted through one or a combination of two or more of higher layer signaling, MAC signaling, and PHY signaling. Alternatively, the table information listed in Table 5 may be predefined in the technical specification.

[0136] At the same time, the maximum number of receiving terminals that can be supported by one PSFCH resource area (hereinafter referred to as "sl-PSFCH-maxnumUE") can be defined. When the number of receiving terminals participating in the side link-multicast communication is less than or equal to sl-PSFCH-maxnumUE, one PSFCH resource area can be used. When the number of receiving terminals participating in the side link-multicast communication exceeds sl-PSFCH-maxnumUE, multiple PSFCH resource areas can be used. In order to support the above operations, the PSFCH configuration information configured by higher layer signaling may include configuration information of multiple PSFCH resource areas. For example, the PSFCH configuration information may include one or more information elements among the information elements shown in Table 6 below.

[0137] [Table 6]

[0138]

[0139] sl-PSFCH-config1 may be PSFCH configuration information that is basically used (e.g., default PSFCH configuration information) regardless of the number of receiving terminals participating in the sidelink-multicast communication. sl-PSFCH-config2 may be PSFCH configuration information (e.g., additional PSFCH configuration information) that is additionally used when the number of receiving terminals participating in the sidelink-multicast communication exceeds sl-PSFCH-maxnumUE. When the number of receiving terminals participating in the sidelink-multicast communication is less than or equal to sl-PSFCH-maxnumUE, sl-PSFCH-config1 may be used. When the number of receiving terminals participating in the sidelink-multicast communication exceeds sl-PSFCH-maxnumUE, both sl-PSFCH-config1 and sl-PSFCH-config2 may be used. The information elements included in sl-PSFCH-config1 (e.g., the information elements listed in Table 3) may be configured independently of the information elements included in sl-PSFCH-config2 (e.g., the information elements listed in Table 3).

[0140] Meanwhile, the transmitting terminal and / or the receiving terminal may receive a higher layer message from the base station and may identify the sidelink configuration information (e.g., PSFCH configuration information) included in the higher layer message. The PSFCH configuration information may be the PSFCH configuration information described in Table 3, Table 4, or Table 6. The transmitting terminal and / or the receiving terminal may use the sidelink configuration information to perform sidelink communication (e.g., sidelink-multicast communication).

[0141] For example, the transmitting terminal may generate an SCI (e.g., a first-stage SCI and / or a second-stage SCI) including scheduling information for transmitting side link data, and send the SCI to the receiving terminal (S1102). The SCI may be transmitted on the PSCCH and / or PSSCH. The SCI may be a public SCI sent to all receiving terminals participating in the side link-multicast communication. Alternatively, the SCI may be a dedicated SCI sent to each receiving terminal participating in the side link-multicast communication. The SCI may further include PSFCH resource information and scheduling information for transmitting HARQ feedback for side link data. For example, when the PSFCH configuration information configured by higher layer signaling includes the information elements listed in Table 3, the PSFCH resource information included in the SCI includes information indicating a specific sl-PSFCH-RB-Ratio.

[0142] When the PSFCH configuration information configured by higher layer signaling includes the information elements listed in Table 4, the PSFCH resource information included in the SCI may include information indicating a specific sl-PSFCH-format and / or sl-PSFCH-RB-Ratio. When the PSFCH configuration information configured by higher layer signaling includes the information elements listed in Table 6, the PSFCH resource information included in the SCI may include information indicating whether sl-PSFCH-config1 is used, information indicating whether sl-PSFCH-config2 is used, and / or information indicating a specific sl-PSFCH-RB-Ratio. The resources allocated to each receiving terminal in the dedicated PSFCH resource area can be explicitly indicated by a UE-specific ID (e.g., a specific RNTI).

[0143] On the other hand, when the NACK-only feedback scheme is used, the HARQ feedback operation may vary for each case described in Table 7 below.

[0144] [Table 7]

[0145]

[0146] [Case A]

[0147] The receiving terminal can receive the SCI from the transmitting terminal by performing a PSCCH monitoring operation and can identify the information included in the SCI (e.g., scheduling information, PSFCH resource information). The transmitting terminal can send sidelink data on the PSSCH indicated by the SCI (S1103). The receiving terminal can detect the sidelink data by performing a PSSCH monitoring operation. When the reception of the sidelink data is successful, the receiving terminal may not send a HARQ response (e.g., ACK) for the sidelink data to the transmitting terminal. That is, the HARQ response may not be transmitted in the shared PSFCH resource area within the PSFCH resource area. When the reception of the SCI scheduled transmission of the sidelink data is successful, the receiving terminal may send information indicating that the SCI has been successfully received (hereinafter referred to as an "SCI reception indicator") to the transmitting terminal (S1104). Alternatively, when the reception of the SCI scheduled transmission of the sidelink data is successful, the receiving terminal may be configured not to send the SCI reception indicator. The SCI reception indicator may be an arbitrary signal or a specific sequence. The SCI reception indicator may be a signal known to all terminals participating in the sidelink-multicast communication (e.g., the transmitting terminal and the receiving terminal).

[0148] The SCI reception indicator can be transmitted through a dedicated PSFCH resource area within the PSFCH resource area. The dedicated PSFCH resource area can be indicated by higher layer signaling or a combination of higher layer signaling and PHY signaling. The SCI reception indicator of the receiving terminal can be multiplexed within the dedicated PSFCH resource area based on the FDM scheme, the TDM scheme and / or the CDM scheme, and the multiplexed SCI reception indicator can be transmitted through the dedicated PSFCH resource area. The SCI reception indicator can be transmitted using the same radio resource. That is, the SCI reception indicator can be transmitted according to an overlapping transmission scheme based on a specific sequence. In this case, the transmitting terminal can identify each of the SCI reception indicators by utilizing a specific sequence.

[0149] Multiple PSFCH resource regions (e.g., PSFCH#1, PSFCH#2) can be configured based on the information elements described in Table 6. In addition, some of all receiving terminals participating in the sidelink-multicast communication can be configured to transmit HARQ responses and / or SCI reception indicators on PSFCH#1. The remaining receiving terminals of all receiving terminals participating in the sidelink-multicast communication can be configured to send HARQ responses and / or SCI reception indicators on PSFCH#2. In this case, some receiving terminals can send SCI reception indicators through a dedicated PSFCH resource region within PSFCH#1, and the remaining receiving terminals can send SCI reception indicators through a dedicated PSFCH resource region within PSFCH#2.

[0150] The transmitting terminal may monitor one or more PSFCH resource regions (e.g., PSFCH#1 and PSFCH#2). If no HARQ response is received in the shared PSFCH resource region within the PSFCH resource region, and an SCI reception indicator is received in the dedicated PSFCH resource region within the PSFCH resource region, the transmitting terminal may determine that the sidelink data has been successfully received at the receiving terminal.

[0151] [Case B]

[0152] The receiving terminal can receive SCI from the transmitting terminal by performing a PSCCH monitoring operation, and can identify the information included in the SCI (e.g., scheduling information, PSFCH resource information). The transmitting terminal can send sidelink data on the PSSCH indicated by the SCI (S1103). The receiving terminal can detect the sidelink data by performing a PSSCH monitoring operation. When the reception (e.g., decoding) of the sidelink data fails, the receiving terminal can send a HARQ response (e.g., NACK) for the sidelink data to the transmitting terminal (S1104). In addition, when the reception of the SCI scheduled transmission of the sidelink data is successful, the receiving terminal can send an SCI reception indicator to the transmitting terminal (S1104). Alternatively, when the reception of the SCI scheduled transmission of the sidelink data is successful, the receiving terminal can be configured not to send the SCI reception indicator. The SCI reception indicator can be an arbitrary signal or a specific sequence. The SCI reception indicator can be a signal known to all terminals participating in the sidelink-multicast communication (e.g., the transmitting terminal and the receiving terminal).

[0153] A HARQ response (e.g., NACK) can be sent through a shared PSFCH resource region within a PSFCH resource region, and an SCI reception indicator can be sent through a dedicated PSFCH resource region within a PSFCH resource region. Each of the shared PSFCH resource region and the dedicated PSFCH resource region can be indicated by a higher layer signaling or a combination of higher layer signaling and PHY signaling. The SCI reception indicator of the receiving terminal can be multiplexed in the dedicated PSFCH resource region based on an FDM scheme, a TDM scheme, and / or a CDM scheme, and the multiplexed SCI reception indicator can be transmitted through the dedicated PSFCH resource region. The SCI reception indicator can be transmitted using the same radio resource. That is, the SCI reception indicator can be transmitted according to an overlapping transmission scheme based on a specific sequence. In this case, the transmitting terminal can identify each of the SCI reception indicators by utilizing a specific sequence.

[0154] Multiple PSFCH resource regions (e.g., PSFCH#1, PSFCH#2) can be configured based on the information elements described in Table 6. In addition, some of all receiving terminals participating in the side link-multicast communication can be configured to transmit HARQ responses and / or SCI reception indicators on PSFCH#1. The remaining receiving terminals of all receiving terminals participating in the side link-multicast communication can be configured to send HARQ responses and / or SCI reception indicators on PSFCH#2. In this case, some receiving terminals can send HARQ responses (e.g., NACK) through the shared PSFCH resource region within PSFCH#1 and can send SCI reception indicators through the dedicated PSFCH resource region within PSFCH#1. The remaining receiving terminals can send HARQ responses (e.g., NACK) through the shared PSFCH resource region within PSFCH#2 and can send SCI reception indicators through the dedicated PSFCH resource region within PSFCH#2.

[0155] The transmitting terminal may monitor one or more PSFCH resource regions (e.g., PSFCH#1 and PSFCH#2). When a HARQ response (e.g., NACK) is received in a shared PSFCH resource region within a PSFCH resource region and an SCI reception indicator is received in a dedicated PSFCH resource region within a PSFCH resource region, the transmitting terminal may determine that, although the receiving terminal has successfully received the SCI, decoding of the sidelink data has failed. In this case, the transmitting terminal may perform a retransmission process for the sidelink data.

[0156] [Case C]

[0157] The receiving terminal may perform a PSCCH monitoring operation. Receiving SCI at the receiving terminal may fail. In this case, since the receiving terminal cannot recognize the scheduling information of the side link data included in the SCI, it may not be possible to obtain the side link data from the transmitting terminal. In this case, the receiving terminal may not be able to send both a HARQ response (e.g., NACK) and an SCI reception indicator to the transmitting terminal. Therefore, the transmitting terminal may not receive both a HARQ response and an SCI reception indicator from the receiving terminal in the PSFCH resource area. In this case, the transmitting terminal may determine that the receiving terminal has failed to receive the SCI and the side link data, and may perform a retransmission process for the side link data. Alternatively, when reception of the SCI fails, the receiving terminal may be configured to send an SCI reception indicator.

[0158] RE puncturing method for energy detection

[0159] When using a NACK-only feedback scheme, an SCI reception indicator (e.g., an arbitrary signal) may be transmitted via a dedicated PSFCH resource region. The transmitting terminal may perform an energy detection operation instead of a signal detection operation to detect the SCI reception indicator. In this case, the transmitting terminal may measure the strength of the signal detected in the REs constituting the dedicated PSFCH resource region and may compare the measured signal strength with a threshold. To determine the threshold, specific REs included in the dedicated PSFCH resource region may be punctured, and an energy level (e.g., a threshold) may be specified.

[0160] Information about the pattern of specific REs within the resource pool allocated for sidelink-multicast communication can be sent to terminals (e.g., transmitting terminals, receiving terminals) via higher layer signaling. The above pattern information can be included in a higher layer message used to transmit resource pool configuration information (e.g., PSFCH configuration information). Alternatively, the above pattern information can be transmitted using a separate higher layer message. A configuration table for various RE patterns to be punctured can be defined. When using sidelink TM#1 or TM#3, the configuration table can be transmitted via DCI.

[0161] Resource allocation method for retransmission process

[0162] When using a NACK-only feedback scheme, the transmitting terminal may not receive a NACK (or a signal corresponding to a NACK) from the receiving terminal in the shared PSFCH resource region. In this case, when an SCI reception indicator is received from all receiving terminals in the dedicated PSFCH resource region, the transmitting terminal may not perform a retransmission process for the sidelink data.

[0163] Alternatively, when NACK (or a signal corresponding to NACK) is not received from a receiving terminal in a shared PSFCH resource area, and an SCI reception indicator is not received from some receiving terminals in a dedicated PSFCH resource area, the transmitting terminal may determine that reception of SCI at some receiving terminals (e.g., receiving terminals that do not transmit SCI reception indicators) has failed. Accordingly, the transmitting terminal may perform a retransmission process for the sidelink data. In this case, the transmitting terminal may select a PSFCH format (e.g., sl-PSFCH-format1, sl-PSFCH-format2) described in Table 4 based on the number of receiving terminals that are targets for retransmission of the sidelink data, and may transmit an SCI including information about the selected PSFCH format on the PSCCH and / or PSSCH.

[0164] Here, the SCI may include scheduling information for retransmission of sidelink data and information about the PSFCH format. The receiving terminal may receive the SCI from the transmitting terminal and may identify the information included in the SCI (e.g., scheduling information, PSFCH format information). The receiving terminal may perform a monitoring operation on the PSSCH indicated by the SCI to obtain sidelink data (e.g., retransmitted sidelink data). The receiving terminal may send a HARQ response based on the result of receiving the sidelink data and the PSFCH format indicated by the SCI. In addition, the receiving terminal may send an SCI reception indicator based on the PSFCH format indicated by the SCI based on the result of receiving the SCI.

[0165] The exemplary embodiments of the present invention can be implemented as program instructions that are executable by various computers and recorded on computer-readable media. The computer-readable media may include program instructions, data files, data structures, or a combination thereof. The program instructions recorded on the computer-readable media may be designed and configured specifically for the present invention, or may be well-known and available to those skilled in the art of computer software.

[0166] Examples of computer-readable media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include machine code produced by, for example, a compiler, and high-level language code executable by a computer using an interpreter. The above-mentioned exemplary hardware devices may be configured to operate as at least one software module to implement embodiments of the present invention, and vice versa.

[0167] Although the embodiments of the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of the invention.

Claims

1. A method for operating a transmitting terminal in a communication system, the method comprising: receiving, from a base station, a higher layer signaling message including dedicated physical sidelink feedback channel configuration information and shared physical sidelink feedback channel configuration information, wherein the dedicated physical sidelink feedback channel configuration information indicates a dedicated physical sidelink feedback channel resource region for transmitting or receiving a response to a reception of sidelink control information, and the shared physical sidelink feedback channel configuration information indicates a shared physical sidelink feedback channel resource region for transmitting or receiving a hybrid automatic repeat request response to data; transmitting sidelink control information including resource allocation information for data to one or more receiving terminals; transmitting data to one or more receiving terminals on a physical sidelink shared channel indicated by the sidelink control information; performing a monitoring operation on a dedicated physical sidelink feedback channel resource region indicated by the dedicated physical sidelink feedback channel configuration information to receive a reception response to the sidelink control information from one or more receiving terminals; as well as performing a monitoring operation on a shared physical side link feedback channel resource region indicated by the shared physical side link feedback channel configuration information to receive a hybrid automatic repeat request response for data from one or more receiving terminals, The dedicated physical side link feedback channel configuration information includes dedicated physical side link feedback channel resource block group information indicating the physical resource block group of the dedicated physical side link feedback channel resource area, and the shared physical side link feedback channel configuration information includes shared physical side link feedback channel resource block group information indicating the physical resource block group of the shared physical side link feedback channel resource area. The physical resource block group used for each of the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area includes one or more physical resource blocks, and the physical resource block group of the dedicated physical side link feedback channel resource area is configured independently of the physical resource block group of the shared physical side link feedback channel resource area.

2. The operating method according to claim 1, wherein: The dedicated physical side link feedback channel resource region and the shared physical side link feedback channel resource region are arranged in the same symbol, and the dedicated physical side link feedback channel resource region and the shared physical side link feedback channel resource region are multiplexed in the frequency domain.

3. The operating method according to claim 1, wherein: The dedicated physical side link feedback channel resource region and the shared physical side link feedback channel resource region are arranged in the same frequency resource, and the dedicated physical side link feedback channel resource region and the shared physical side link feedback channel resource region are multiplexed in the time domain.

4. The operating method according to claim 1, wherein: Information indicating a ratio between a size of a shared physical sidelink feedback channel resource region and a size of a dedicated physical sidelink feedback channel resource region is received from the base station.

5. The operating method according to claim 1, wherein: The sidelink control information further includes information indicating a dedicated physical sidelink feedback channel resource region and a shared physical sidelink feedback channel resource region, and the dedicated physical sidelink feedback channel resource region and the shared physical sidelink feedback channel resource region are configured within a resource range.

6. The operating method according to claim 1, wherein: When the reception response indicates that the sidelink control information has been successfully received and no hybrid automatic repeat request response is received in the shared physical sidelink feedback channel resource region, it is determined that the data has been successfully received by the one or more receiving terminals.

7. The operating method according to claim 1, wherein: When the reception response is not received, it is determined that reception of the sidelink control information has failed in one or more receiving terminals.

8. A method for operating a receiving terminal in a communication system, the method comprising: receiving, from a base station, a higher layer signaling message including dedicated physical sidelink feedback channel configuration information and shared physical sidelink feedback channel configuration information, wherein the dedicated physical sidelink feedback channel configuration information indicates a dedicated physical sidelink feedback channel resource region for transmitting or receiving a response to a reception of sidelink control information, and the shared physical sidelink feedback channel configuration information indicates a shared physical sidelink feedback channel resource region for transmitting or receiving a hybrid automatic repeat request response to data; obtaining sidelink control information including resource allocation information for data from a transmitting terminal; sending a reception response for the sidelink control information to the transmitting terminal through the dedicated physical sidelink feedback channel resource region indicated by the dedicated physical sidelink feedback channel configuration information; as well as performing a monitoring operation on a physical sidelink shared channel indicated by the sidelink control information to obtain data from the transmitting terminal, The dedicated physical side link feedback channel configuration information includes dedicated physical side link feedback channel resource block group information indicating the physical resource block group of the dedicated physical side link feedback channel resource area, and the shared physical side link feedback channel configuration information includes shared physical side link feedback channel resource block group information indicating the physical resource block group of the shared physical side link feedback channel resource area. The physical resource block group used for each of the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area includes one or more physical resource blocks, and the physical resource block group of the dedicated physical side link feedback channel resource area is configured independently of the physical resource block group of the shared physical side link feedback channel resource area.

9. The operating method according to claim 8, further comprising: When reception of the data fails, a negative acknowledgement for the data is sent to the transmitting terminal through the shared physical side link feedback channel resource region indicated by the shared physical side link feedback channel configuration information.

10. The operating method according to claim 8, wherein: When the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area are arranged in the same symbol, the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area are multiplexed in the frequency domain; when the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area are arranged in the same frequency resource, the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area are multiplexed in the time domain.

11. The operating method according to claim 8, wherein: Information indicating a ratio between a size of a shared physical sidelink feedback channel resource region and a size of a dedicated physical sidelink feedback channel resource region is received from the base station.

12. The operating method according to claim 8, wherein: The sidelink control information further includes information indicating a dedicated physical sidelink feedback channel resource region and a shared physical sidelink feedback channel resource region, and the dedicated physical sidelink feedback channel resource region and the shared physical sidelink feedback channel resource region are configured within a resource range.

13. A method for operating a base station in a communication system, the method comprising: configuring a dedicated physical sidelink feedback channel resource region for sending and receiving reception responses for sidelink control information; configuring a shared physical sidelink feedback channel resource region for sending and receiving hybrid automatic repeat request responses for data; and sending a higher layer signaling message including physical side link feedback channel configuration information, wherein the physical side link feedback channel configuration information includes configuration information of a dedicated physical side link feedback channel resource region and configuration information of a shared physical side link feedback channel resource region, The configuration information of the dedicated physical side link feedback channel resource area includes dedicated physical side link feedback channel resource block group information indicating the physical resource block group of the dedicated physical side link feedback channel resource area, and the configuration information of the shared physical side link feedback channel resource area includes shared physical side link feedback channel resource block group information indicating the physical resource block group of the shared physical side link feedback channel resource area. The physical resource block group used for each of the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area includes one or more physical resource blocks, and the physical resource block group of the dedicated physical side link feedback channel resource area is configured independently of the physical resource block group of the shared physical side link feedback channel resource area.

14. The operating method according to claim 13, wherein: When the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area are arranged in the same symbol, the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area are multiplexed in the frequency domain; when the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area are arranged in the same frequency resource, the dedicated physical side link feedback channel resource area and the shared physical side link feedback channel resource area are multiplexed in the time domain.

15. The operating method according to claim 13, wherein: The physical side link feedback channel configuration information is configured with physical side link feedback channel format 1 and physical side link feedback channel format 2, and physical side link feedback channel format 1 or physical side link feedback channel format 2 is used according to the number of one or more receiving terminals, and the union of the shared physical side link feedback channel resource area and the dedicated physical side link feedback channel resource area indicated by physical side link feedback channel format 1 is different from the union of the shared physical side link feedback channel resource area and the dedicated physical side link feedback channel resource area indicated by physical side link feedback channel format 2.

16. The operating method according to claim 13, wherein: The physical side link feedback channel configuration information is configured with physical side link feedback channel configuration information 1 and physical side link feedback channel configuration information 2. When the number of one or more receiving terminals is less than or equal to a threshold, the physical side link feedback channel configuration information 1 is used; when the number of one or more receiving terminals exceeds the threshold, the physical side link feedback channel configuration information 1 and the physical side link feedback channel configuration information 2 are used, and the shared physical side link feedback channel resource area and the dedicated physical side link feedback channel resource area indicated by the physical side link feedback channel configuration information 1 are configured independently of the shared physical side link feedback channel resource area and the dedicated physical side link feedback channel resource area indicated by the physical side link feedback channel configuration information 2.

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